Over the course of the past 12 months, I have spent £1558.66 on LPG to heat a 300-year-old granite cottage. For most of that time I have been comfortable, although I have occasionally felt cold. At the moment I am wearing (above waist) a vest, t-shirt and fleece. If I were cold, I would add an insulated jacket, and if I were too warm I would remove the fleece. I suspect that this represents roughly 7.5% of my annual income (USS + state pension), which seems not unreasonable to me.
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** Phil.